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Kevin Wolf eb8a0cf3ba qcow2: Forward ZERO_WRITE flag for full preallocation 
The BDRV_REQ_ZERO_WRITE is currently implemented in a way that first the
image is possibly preallocated and then the zero flag is added to all
clusters. This means that a copy-on-write operation may be needed when
writing to these clusters, despite having used preallocation, negating
one of the major benefits of preallocation.

Instead, try to forward the BDRV_REQ_ZERO_WRITE to the protocol driver,
and if the protocol driver can ensure that the new area reads as zeros,
we can skip setting the zero flag in the qcow2 layer.

Unfortunately, the same approach doesn't work for metadata
preallocation, so we'll still set the zero flag there.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20200424142701.67053-1-kwolf@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2020-04-30 17:51:07 +02:00

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== Commit tests ==
Formatting 'TEST_DIR/PID-base', fmt=qcow2 size=2097152 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Formatting 'TEST_DIR/PID-mid', fmt=qcow2 size=1048576 backing_file=TEST_DIR/PID-base cluster_size=65536 lazy_refcounts=off refcount_bits=16
Formatting 'TEST_DIR/PID-top', fmt=qcow2 size=2097152 backing_file=TEST_DIR/PID-mid cluster_size=65536 lazy_refcounts=off refcount_bits=16
wrote 2097152/2097152 bytes at offset 0
2 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== Check visible data ===
read 1048576/1048576 bytes at offset 0
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 1048576/1048576 bytes at offset 1048576
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== Checking allocation status ===
1048576/1048576 bytes allocated at offset 0 bytes
1048576/1048576 bytes allocated at offset 1 MiB
0/1048576 bytes allocated at offset 0 bytes
0/0 bytes allocated at offset 1 MiB
0/1048576 bytes allocated at offset 0 bytes
0/1048576 bytes allocated at offset 1 MiB
=== Checking map ===
[{ "start": 0, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": 327680}]
Offset Length Mapped to File
0 0x200000 0x50000 TEST_DIR/PID-base
[{ "start": 0, "length": 1048576, "depth": 1, "zero": false, "data": true, "offset": 327680}]
Offset Length Mapped to File
0 0x100000 0x50000 TEST_DIR/PID-base
[{ "start": 0, "length": 1048576, "depth": 2, "zero": false, "data": true, "offset": 327680},
{ "start": 1048576, "length": 1048576, "depth": 0, "zero": true, "data": false}]
Offset Length Mapped to File
0 0x100000 0x50000 TEST_DIR/PID-base
=== Testing qemu-img commit (top -> mid) ===
Image committed.
image: TEST_IMG
file format: IMGFMT
virtual size: 2 MiB (2097152 bytes)
cluster_size: 65536
backing file: TEST_DIR/PID-base
Format specific information:
compat: 1.1
lazy refcounts: false
refcount bits: 16
corrupt: false
read 1048576/1048576 bytes at offset 0
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 1048576/1048576 bytes at offset 1048576
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== Testing HMP commit (top -> mid) ===
Formatting 'TEST_DIR/PID-base', fmt=qcow2 size=2097152 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Formatting 'TEST_DIR/PID-mid', fmt=qcow2 size=1048576 backing_file=TEST_DIR/PID-base cluster_size=65536 lazy_refcounts=off refcount_bits=16
Formatting 'TEST_DIR/PID-top', fmt=qcow2 size=2097152 backing_file=TEST_DIR/PID-mid cluster_size=65536 lazy_refcounts=off refcount_bits=16
wrote 2097152/2097152 bytes at offset 0
2 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
{"execute": "human-monitor-command", "arguments": {"command-line": "commit drive0"}}
{"return": ""}
image: TEST_IMG
file format: IMGFMT
virtual size: 2 MiB (2097152 bytes)
cluster_size: 65536
backing file: TEST_DIR/PID-base
Format specific information:
compat: 1.1
lazy refcounts: false
refcount bits: 16
corrupt: false
read 1048576/1048576 bytes at offset 0
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 1048576/1048576 bytes at offset 1048576
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== Testing QMP active commit (top -> mid) ===
Formatting 'TEST_DIR/PID-base', fmt=qcow2 size=2097152 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Formatting 'TEST_DIR/PID-mid', fmt=qcow2 size=1048576 backing_file=TEST_DIR/PID-base cluster_size=65536 lazy_refcounts=off refcount_bits=16
Formatting 'TEST_DIR/PID-top', fmt=qcow2 size=2097152 backing_file=TEST_DIR/PID-mid cluster_size=65536 lazy_refcounts=off refcount_bits=16
wrote 2097152/2097152 bytes at offset 0
2 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
{"execute": "block-commit", "arguments": {"auto-dismiss": false, "base-node": "mid", "device": "top", "job-id": "job0"}}
{"return": {}}
{"execute": "job-complete", "arguments": {"id": "job0"}}
{"return": {}}
{"data": {"device": "job0", "len": 0, "offset": 0, "speed": 0, "type": "commit"}, "event": "BLOCK_JOB_READY", "timestamp": {"microseconds": "USECS", "seconds": "SECS"}}
{"data": {"device": "job0", "len": 0, "offset": 0, "speed": 0, "type": "commit"}, "event": "BLOCK_JOB_COMPLETED", "timestamp": {"microseconds": "USECS", "seconds": "SECS"}}
{"execute": "job-dismiss", "arguments": {"id": "job0"}}
{"return": {}}
image: TEST_IMG
file format: IMGFMT
virtual size: 2 MiB (2097152 bytes)
cluster_size: 65536
backing file: TEST_DIR/PID-base
Format specific information:
compat: 1.1
lazy refcounts: false
refcount bits: 16
corrupt: false
read 1048576/1048576 bytes at offset 0
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 1048576/1048576 bytes at offset 1048576
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
== Resize tests ==
=== preallocation=off ===
Formatting 'TEST_DIR/PID-base', fmt=qcow2 size=6442450944 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Formatting 'TEST_DIR/PID-top', fmt=qcow2 size=1073741824 backing_file=TEST_DIR/PID-base cluster_size=65536 lazy_refcounts=off refcount_bits=16
wrote 65536/65536 bytes at offset 5368709120
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Image resized.
read 65536/65536 bytes at offset 5368709120
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
1 GiB (0x40000000) bytes not allocated at offset 0 bytes (0x0)
7 GiB (0x1c0000000) bytes allocated at offset 1 GiB (0x40000000)
[{ "start": 0, "length": 1073741824, "depth": 1, "zero": true, "data": false},
{ "start": 1073741824, "length": 7516192768, "depth": 0, "zero": true, "data": false}]
=== preallocation=metadata ===
Formatting 'TEST_DIR/PID-base', fmt=qcow2 size=34359738368 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Formatting 'TEST_DIR/PID-top', fmt=qcow2 size=32212254720 backing_file=TEST_DIR/PID-base cluster_size=65536 lazy_refcounts=off refcount_bits=16
wrote 65536/65536 bytes at offset 33285996544
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Image resized.
read 65536/65536 bytes at offset 33285996544
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
30 GiB (0x780000000) bytes not allocated at offset 0 bytes (0x0)
3 GiB (0xc0000000) bytes allocated at offset 30 GiB (0x780000000)
[{ "start": 0, "length": 32212254720, "depth": 1, "zero": true, "data": false},
{ "start": 32212254720, "length": 536870912, "depth": 0, "zero": true, "data": false, "offset": 327680},
{ "start": 32749125632, "length": 536870912, "depth": 0, "zero": true, "data": false, "offset": 537264128},
{ "start": 33285996544, "length": 536870912, "depth": 0, "zero": true, "data": false, "offset": 1074200576},
{ "start": 33822867456, "length": 536870912, "depth": 0, "zero": true, "data": false, "offset": 1611137024},
{ "start": 34359738368, "length": 536870912, "depth": 0, "zero": true, "data": false, "offset": 2148139008},
{ "start": 34896609280, "length": 536870912, "depth": 0, "zero": true, "data": false, "offset": 2685075456}]
=== preallocation=falloc ===
Formatting 'TEST_DIR/PID-base', fmt=qcow2 size=10485760 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Formatting 'TEST_DIR/PID-top', fmt=qcow2 size=5242880 backing_file=TEST_DIR/PID-base cluster_size=65536 lazy_refcounts=off refcount_bits=16
wrote 65536/65536 bytes at offset 9437184
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Image resized.
read 65536/65536 bytes at offset 9437184
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
5 MiB (0x500000) bytes not allocated at offset 0 bytes (0x0)
10 MiB (0xa00000) bytes allocated at offset 5 MiB (0x500000)
[{ "start": 0, "length": 5242880, "depth": 1, "zero": true, "data": false},
{ "start": 5242880, "length": 10485760, "depth": 0, "zero": false, "data": true, "offset": 327680}]
=== preallocation=full ===
Formatting 'TEST_DIR/PID-base', fmt=qcow2 size=16777216 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Formatting 'TEST_DIR/PID-top', fmt=qcow2 size=8388608 backing_file=TEST_DIR/PID-base cluster_size=65536 lazy_refcounts=off refcount_bits=16
wrote 65536/65536 bytes at offset 11534336
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Image resized.
read 65536/65536 bytes at offset 11534336
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
8 MiB (0x800000) bytes not allocated at offset 0 bytes (0x0)
4 MiB (0x400000) bytes allocated at offset 8 MiB (0x800000)
[{ "start": 0, "length": 8388608, "depth": 1, "zero": true, "data": false},
{ "start": 8388608, "length": 4194304, "depth": 0, "zero": false, "data": true, "offset": 327680}]
=== preallocation=off ===
Formatting 'TEST_DIR/PID-base', fmt=qcow2 size=393216 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Formatting 'TEST_DIR/PID-top', fmt=qcow2 size=259072 backing_file=TEST_DIR/PID-base cluster_size=65536 lazy_refcounts=off refcount_bits=16
wrote 65536/65536 bytes at offset 259072
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Image resized.
read 65536/65536 bytes at offset 259072
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
192 KiB (0x30000) bytes not allocated at offset 0 bytes (0x0)
320 KiB (0x50000) bytes allocated at offset 192 KiB (0x30000)
[{ "start": 0, "length": 196608, "depth": 1, "zero": true, "data": false},
{ "start": 196608, "length": 65536, "depth": 0, "zero": false, "data": true, "offset": 327680},
{ "start": 262144, "length": 262144, "depth": 0, "zero": true, "data": false}]
=== preallocation=off ===
Formatting 'TEST_DIR/PID-base', fmt=qcow2 size=409600 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Formatting 'TEST_DIR/PID-top', fmt=qcow2 size=262144 backing_file=TEST_DIR/PID-base cluster_size=65536 lazy_refcounts=off refcount_bits=16
wrote 65536/65536 bytes at offset 344064
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Image resized.
read 65536/65536 bytes at offset 344064
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
256 KiB (0x40000) bytes not allocated at offset 0 bytes (0x0)
256 KiB (0x40000) bytes allocated at offset 256 KiB (0x40000)
[{ "start": 0, "length": 262144, "depth": 1, "zero": true, "data": false},
{ "start": 262144, "length": 262144, "depth": 0, "zero": true, "data": false}]
=== preallocation=off ===
Formatting 'TEST_DIR/PID-base', fmt=qcow2 size=524288 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Formatting 'TEST_DIR/PID-top', fmt=qcow2 size=262144 backing_file=TEST_DIR/PID-base cluster_size=65536 lazy_refcounts=off refcount_bits=16
wrote 65536/65536 bytes at offset 446464
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Image resized.
read 65536/65536 bytes at offset 446464
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
256 KiB (0x40000) bytes not allocated at offset 0 bytes (0x0)
244 KiB (0x3d000) bytes allocated at offset 256 KiB (0x40000)
[{ "start": 0, "length": 262144, "depth": 1, "zero": true, "data": false},
{ "start": 262144, "length": 249856, "depth": 0, "zero": true, "data": false}]
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